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Conglomerate
Conglomerate of the Cretaceous Kootenai Formation, Montana. Photo is about 0.5m across. (130727-66)
Download ImageColumnar jointing in basalt, Montana
Colonnade in 50 Ma basalt flow, SW Montana (130725-8)
Download ImageColumnar jointing in basalt, Montana
Colonnade in 50 Ma basalt flow, SW Montana (130725-5)
Download ImageBasalt columns, SW Montana (vertical)
Colonnade in 50 Ma basalt flow, SW Montana (130725-3)
Download ImageCobbles along lakeshore, Montana
Cobbles along shoreline of glacial Lake McDonald, Glacier National Park, Montana (130724-12)
Download ImageDiorite, weathered and fresh surfaces
Close-up view of diorite showing both weathered (top) and fresh surfaces. Penny for scale. Purcell sill, Glacier National Park, Montana. (130723-65)
Download ImageProterozoic mudcracks, Montana
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. (130723-55)
Download ImageProterozoic mudcracks, Montana
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. Photo about .75m across. (130723-53)
Download ImageProterozoic mudcracks, Montana (vertical)
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. Photo about .20cm across. (130723-52)
Download ImageProterozoic mudcracks, Montana
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. (130723-35)
Download ImagePurcell Sill, Montana (vertical)
Diorite sill (Purcell sill), intruding sedimentary rock of Proterozoic Belt Supergroup. Note the zone of bleaching along the sill caused by contact metamorphism. (130723-7)
Download ImageThrust fault, SW Montana
Thrust fault cutting dipping limestone of the Cretaceous Kootenai Formation, SW Montana. (130716-7)
Download ImageFolded limestone and thrust fault
Folded limestone and thrust fault, SW Montana (130716-5)
Download ImageFolds and thrust fault, Montana (Pan)
Folded limestone and thrust fault, SW Montana (130716-5)
Download ImageNonconformity. Northern Utah.
Nonconformity between basement rock (gray) and overlying Cambrian Tintic Quartzite (tan). Behind Ogden, Utah. (130712-41)
Download ImageNonconformity. Northern Utah.
Nonconformity between basement rock (gray) and overlying Cambrian Tintic Quartzite (tan). Behind Ogden, Utah. (130712-39)
Download ImageEocene palm frond and Herring (vertical)
Fossilized Eocene palm frond and herring. Green River Formation, Wyoming. Photo is about 1.5 m high. (180629-41)
Download ImageEocene Herring and palm frond
Fossilized Eocene herring and palm frond. Green River Formation, Wyoming. Fish is about 8cm long (180629-39)
Download ImageErosion of sea stack, Oregon (Vertical)
Fracture-controlled erosion of sandstone sea stack, Bandon, Oregon coast. (180616-97)
Download ImagePorphyroclasts and kink bands ~20cm across
Porphyroclasts and kink bands (~20cm across) in sheared, mylonitic schist. Granitic porphyroclast near center originated as a sigma type porphyroclast (indicates top-left sense-of-shear) but was rotated by the kink band to appear like a delta-type to mistakenly indicate the opposite sense. (170401-19)
Download ImageMeandering river and tidal inlet, Oregon
Aerial photo of meandering stream and tidal inlet between two sand spits, Sand Lake, Oregon. (100723-86)
Download Image
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